Nut-lock.



N5. 785,528. PATENTED MAR. 21, 1905.

0.5. THOMPSON. i 5

NUT 1.00K.

APFLIOATION FILED FEB. 8, 1904.

l @141141115051 C'JM m Jaw Patented March 21,1905.

PATENT OFFICE.

CHARLES ROBERT THOMPSON, OF POOATELLO, IDAHO.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. '785,528,7dated March21, 1905.

Application filed February 8, 1904. Serial No. 192,679.

Be it known that I, CHARLES ROBERT THOMP- soN, a citizen of the UnitedStates, residing at Pocatello, in the county of Bannock and State ofIdaho, have invented a new and useful [mprovement in Nut-Locks, of whichthe following is a specification.

This invention relates to a nut-lock, ythe principal usc of which is inconnection with railroads for joining the ends of rails, the objectbeing to provide a simple and efficient means for locking nuts to thebolts to prevent them from being shaken or jarred off by passing trainsand to permit the locking mechanism being disengaged, so that the nutmay be removed from the bolt.

To this end the invention consists of animproved nut and bolt inconnection with a locking device, the novel features and arrangement ofwhich will be herein set forth in the following descriptionin connectionwith the drawings and pointed out in the claims.

In the accompanying drawings,Figure 1 represents a face view of myimproved nut-lock as applied to a bolt. Fig. 2 is a sectional viewl ofthe same on the line (t a looking in the direction indicated by thearrows. Fig. 3 is a perspective view of the nut detached. Fig. 1 is asimilar view of a bolt used in connection with the nut. Fig. 5 is aperspective view of an implement for disengaging the locking device topermit the removal of the nut from the bolt. l

Similar numerals of reference indicate corresponding parts in all thefigures of the drawings.

The numeral 1 indicates a bolt the threaded end of which is provided fora portion of its length with a plurality of notches 2, each having asubstantially radial side 3 and a curved or inclined side 4. The notches2 may be impressed in the blank during the process of manufacture or cutin the bolt either before or after threading. y

A nut 5, threaded to lit the bolt, has formed therein on its outer side,and preferably during the process of manufacture, a concentric groove ordepression 6, which extends almost entirely around the bolt-hole 7.About onethe narrow part 8 of the depression or groove Y 6 is a bridge10, preferably formed by bending an outstanding lug (shown at 11, Fig.2, in dotted lines) across said depression and welding it to the body ofthe nut. Within the groove or depression 6 is placed a flat curvedspring 13, concentric for the greater part of its length with the axisof the bolt, but having its operative end curved inwardly on a shorterradius to enter under tension the notches 2 on the bolt. The spring 13is placed in the groove 6, beginning at the end 12 and carried down theaforesaid inclined surface and around the groove under the bridge as faras it will go. The nut is then screwed on the bolt, the bridge 10preventing the spring from becoming displaced. As the nut is turned theend of the spring 13 successively enters the notches 2 until the nutreaches its limit of movement, at which time the end of the spring willrest in one of the notches on the bolt, bearing against the radial face3 thereof, and effectually prevent a reverse movement of the nut.

At times it is desirable to remove a nut without destroying it or thebolt. pose I use an implement such as is represented in Fig. 5, wherein14k indicates the handle, and 15 the Working end of the implement. Thelatter end is concaved on oneside, (not shown,) while its opposite sideis provided with a longitudinal shoulder 16, which when placed betweenthe spring and the bolt engages the end of the spring and holds it awayfrom the notches 2. The nut may now be readily turned and removed fromthe bolt.

Having thus described the invention, what is claimed as new is 1. In anut-lock, a bolt having longitudinal notches, combined with a nut havinga concentric groove or depression in one face, said groove beingnarrower at one part than at another and a bridge across said narrowpart, and a spring in said groove or depression be- For this pur- IOOgrooves combined with a nut having a concentric groove formed in oneface thereof, and a bridge integral with the nut extending across saidgroove, and a curved spring in said groove held in place by said bridge.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

CHARLES ROBERT THOMPSON.

Witnesses:

ANDREW BERTNER S'rnvnNsoN, BENJAMIN FRANKLiN SoARBoRoUGH.

